Wavelet analysis of ADITYA edge turbulence: Evidence of non-linear interaction
- Institute for Plasma Research, Bhat, Gandhinagar 382 424 (India)
The edge turbulence in the ADITYA tokamak [Phys. Rev. Lett. {bold 69}, 1375 (1992)] is examined using wavelet analysis techniques. The wavelet filters are used to separate low and high frequency components. The filtered plasma density and floating potential fluctuations show leptokurtic non-Gaussianity (kurtosis, {ital K}{approx_gt}3) at high frequencies, whereas, the low frequency components are nearly Gaussian. The recently developed wavelet bicoherence technique [Phys. Plasmas {bold 2}, 3017 (1995)] is extended to the Mexican hat wavelet. When the data are examined using wavelet bicoherence technique, it is found that the turbulent density and potential signals exhibit {ital episodes} of quadratic interaction in which low and high frequency components are coupled. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 286349
- Journal Information:
- Physics of Plasmas, Vol. 3, Issue 8; Other Information: PBD: Aug 1996
- Country of Publication:
- United States
- Language:
- English
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